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Binary compound. A binary compound is a chemical compound that contains exactly two different elements. Examples of binary ionic compounds include calcium chloride (CaCl2), sodium fluoride (NaF), and magnesium oxide (MgO), whilst examples of binary covalent compounds include water (H2O), and sulfur hexafluoride (SF6)
Potassium Iodide is an binary ionic compound formed from a metal and a non-metal. Potassium is an Alkali Metal in the first column of the periodic table. This means that potassium has 1 valence electron it readily gives away in order to seek the stability of the octet. This makes potassium a #K^(+1)# cation. Iodine is a Halogen in the 17th column or #p^5# group.